We first summarize the basic results of the RG formulation of Landau Fermi liquid theory, pioneered by Polchinski [1]} and by Shankar [2]}, which will be invoked in the discussion that follows. To keep things simple, we will present the key results for a rotationally-invariant Fermi surface. The generalization appropriate for anisotropic Fermi surfaces, relevant to crystalline systems, is discussed below.
